An item, made of rubber or plastic, usually cylindrical, with or without a flange, having one or more holes extending through its entire length, usually parallel to its axis. The overall length must exceed 25 percent of its diameter or a distance across the peripheral flats for items without a flange. For items formed of other material see BUSHING, SLEEVE. Excludes BUMPER, NONMETALLIC and GROMMET NONMETALLIC.